Svetoslav,
In the future please post the specs about your hosting OS, version of Magento, etc. I am going to just post some typical solutions to your problem.
Run Indexing from the CLI
from the CLI at the root of your magento installation
php shell/indexer.php --reindex catalog_product_price
No folders in var/
- Make sure that the var/
var/
folder has the correct file permissions and ownership. Magento needs to write to those folders.
Magento Permissions & Privileges
- I recently ran across an install of magento that located the var folder in the root tmp folder of the server, you may want to check there. It was located in "/tmp/magento/var/"
/tmp/magento/var/
If your var folder is located there, it is because you have a permissions issue.
Change your memory limit
I agree with sean! Change this in your .htaccess.htaccess
that is located in your site root
ini_set('memory_limit','2048M');
ini_set('memory_limit','2048M');